55143040 has 32 divisors (see below), whose sum is σ = 131827860. Its totient is φ = 22056960.

The previous prime is 55142999. The next prime is 55143041. The reversal of 55143040 is 4034155.

It can be written as a sum of positive squares in 2 ways, for example, as 50580544 + 4562496 = 7112^2 + 2136^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (55143041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42441 + ... + 43720.

Almost surely, 2^55143040 is an apocalyptic number.

It is an amenable number.

55143040 is an abundant number, since it is smaller than the sum of its proper divisors (76684820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55143040 is an equidigital number, since it uses as much as digits as its factorization.

55143040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86180 (or 86168 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 55143040 is about 7425.8359798746. The cubic root of 55143040 is about 380.6246420906.

Adding to 55143040 its reverse (4034155), we get a palindrome (59177195).

The spelling of 55143040 in words is "fifty-five million, one hundred forty-three thousand, forty".